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Years in Production / 1978–1981
Allis-Chalmers
8550
Explore the specifications, hardware, and original references for the Allis-Chalmers 8550.
300hp
Source index power
4x4 Only
Drive
1978–1981
Production years
Allis-Chalmers
Manufacturer
8550 / 01
At a glance
Production
Four-wheel Drive (4WD) tractor
- Manufacturer
- Allis Chalmers
- Original Price
- $86,753
Mechanical
Four-wheel drive
Hydraulic wet discs brakes
Acousta Cab II standard with heat and air-conditioning. Optional radio and 8 track tape deck.
- Steering
- hydrostatic power
Hydraulics
- Type
- closed center
- Valves
- 3 or 4
- Pump Flow
- 74.9 gpm283.5 lpm
Hitch
- Rear Type
- IV/III
Pto
- Rear Pto
- independent
- Rear Type
- 1000
Electrical
- Ground
- negative
- Charging System
- alternator
- Batteries
- 4
- Battery Volts
- 12
8550 / 02
Under the hood
Engine Detail
Allis Chalmers 6120T
turbocharged diesel
6-cylinder 24-valve
liquid-cooled inline
- Displacement
- 731 ci12.0 L
- Bore Stroke
- 5.25x6.25 inches133 x 159 mm
- Power
- 300 hp223.7 kW
- Air Cleaner
- dry
- Compression Ratio
- 16.25:1
- Rated Rpm
- 2500
- Idle Rpm
- 775-2800
- Firing Order
- 1-5-3-6-2-4
- Starter Volts
- 12
- Oil Capacity
- 46 qts (2 filter)43.5 L
- Oil Capacity
- 60 qts (3 filter)56.8 L
- Coolant Capacity
- 72 qts68.1 L
- Intake Valve Clearance
- 0.015 inches (hot)0.381 mm
- Exhaust Valve Clearance
- 0.020 inches (hot)0.508 mm
- Cylinders
- 6
- Cooling
- liquid-cooled inline
Engine Options
Allis Chalmers 12.0L 6-cyl diesel
- Fuel Tank
- 170 gal643.5 L
8550 / 03
Gears & controls
Transmission
- Transmission
- Power Director
- Transmission Type
- partial power shift
- Gears
- 20 forward and 4 reverse
8550 / 04
Size. Stance. Footprint.
Dimensions
- Length
- 285 in723 cm
- Width
- 95.5 in242 cm
- Height (cab)
- 139 in353 cm
- Wheelbase
- 126 in320 cm
- Ground clearance
- 17 in43 cm
- Front tread
- 62 in157 cm
- Rear tread
- 62 in157 cm
Dimensions And Tires
- Wheelbase
- 126 inches320 cm
- Weight
- 26400 to 27040 pounds
- Front Tire
- 18.4x38
- Rear Tire
- 18.4x38
Tires And Tracks
- Front Ag
- 18.4x38
- Front Ag
- 20.8x34
- Front Ag
- 20.8x38
- Front Ag
- 23.1x30
- Front Ag
- 24.5x32
- Front Ag
- 30.5x32
- Rear Ag
- 18.4x38
- Rear Ag
- 20.8x34
- Rear Ag
- 20.8x38
- Rear Ag
- 23.1x30
- Rear Ag
- 24.5x32
- Rear Ag
- 30.5x32
8550 / 05
Tractor Photos
See it in action
Videos
Watch Allis-Chalmers 8550 videos from their original YouTube creators.
8550 / 07
Tests (NTTL)
Nebraska Tractor Test 1262
Diesel 20-speed 4WDOctober 15 - 28, 1977
PTO performance
Drawbar performance
Gear 5SL used for power test.
Gear 2SL used for pull test.
- Id
- 1262
- Power At Rated Engine Speed
- 253.88 hp189.3 kW
- Fuel Use
- 17.4 gal/hour65.9 l/hour
- Fuel Use
- 17.5 gal/hour66.2 l/hour
- Max Power
- 217.92 hp162.5 kW
- Max Pull
- 26,220 lbs11893 kg